Newcastle or Bronchitis

I have had a batch of chickens with symptoms of Newcastle and bronchitis. I have given them anti-biotics and most of them have cleared up (about 3-4 still have symptoms but are improving). I'm getting a new batch of birds (likely today) and need to use the coop. I have cleaned it out and will put new bedding in but am wondering if I need to disinfect or anything. Suggestions?

I really don't know what they have. During Halloween, their light went out (they were about 3 weeks old), a few died and several were sneezing, running eye, and some had eyes closed shut...and a few were real droopy, weak like. I have given an anti-biotic and most have cleared up. I've moved all of them out of the coop and was wondering what I should use if anything to kill any virus or bacteria in the brooder.